JETP, Vol. 69,
No. 5,
p. 1001 (November 1989)
(Russian original - ZhETF,
Vol. 96,
No. 5,
p. 1773,
November 1989
)
Electron-phonon system with strong coupling and violation of the Migdal-Eliashberg theory
A.S. Aleksandrov, E.A. Mazur
Received: December 30, 1988
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